Steam-valve gear



2 Sheets-Sheet 1.

(o Model.)

lVI. MURPHY.

STEAM VALVE GEAR.

Patented Apr. 13, 1.886. y

(No Model.) 2 Sheets-Sheet 2.

M. MURPHY.

STEAM VALVE GEAR. No. 340,054. Patented Apr. 13, 1886.

lmllllllllll'l'll-l liimuifw" mik" UNrTnn STATI-3s PATENT OFFICE.

MERRICK MURPHY, OF MILWAUKEE, VISCONSIN.

STEAM-VALVE G EAR.

SPECIFICATION forming part of Letters Patent No. 340,054, dated April 13, 1886.

Application filed January 9, 1886. Serial No. 188,008. (No model.)

To all whom it may concern:

Beit known that I, MERRICK MURPHY, of Milwaukee, in the county of Milwaukee, and in the State of lVisconsin, have invented certain new and useful Improvements in Steam- Valve Gear; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention relates to balanced valves,and will be full described hereinafter.

In the drawings, Figure i. is a central vertical section through the center of a cylinder and my improved valve. Fig. 2 is a side View of my valve. Fig. 3 is a plan view of my valve with the top of the chest removed. Fig. 4 is a section.

A is the cylinder, having the usual end ports, a a, that each lead to a valve-chamber, B.

C is the steam-chest.

D are wing-valves, the shafts d of which have their bearings in stufliug-boxes il. One end of each shaft d extends through its bearing and through the steam-chest, and has clamped on it a trip-iinger, E, and the lower end of this finger is squared on one side to take against the end of a tripping-spring, F, as the finger is going in one direction, and is rounded on the other side to permit the tripping-spring a free passage under it while going in the opposite direction.

There are two tripping-springs, F, and each is secured at one end to a pivoted apron, F', while its free cud rises high enough to strike atrip-inger, E, as the apron is reciprocated. The aprons F I? are connected centrally by a spring-strap, G, which has a tendency to support them in a horizontal position, and the center of this strap G is supported by a cam, G', that works freely on a stud, g, that pro- 40 jects from the steam-chest, andthe hub of this designed to cover an exhaust-port, m m. The shafts by which these valves M M are hung have their bearings in sides of the valvechainber and steam-chest, and one end of leach shaft extends out of the chest on one side, where each shaft is provided with a crankarm, of, and these two arms are connected by a rod, mi. The arms m2 are set so as to hang at obtuse angles to each other, and therefore when one valve is opened its shaft will close the other.

It will be seen that my valves are perfectly balanced, and that as one inlet valveis opened its companion exhaust-valve is immediately closed by the entering steam, and as it closes it opens the exhaust-valve in the opposite chamber, and thus the exhaust -ports are opened and closed without any expenditure of power.

I-Iaving thus fully described my invention, what I clailn as new, and desire to secure by Letters Iatent, is-

1. The con'lbination, with the inlet and exhaust ports, of a pair of oscillating valves 1ocated therein, and carrying each upon its shaft a tripping-finger, a. reciprocating frame carrying a two-part pivoted apron having a sustaining-spring, tripping-springs located each upon one ofthe apron-sections to engage the tripping-fingers, and a iixed oscillating cam-arm operating to raise and depress the apron-sections, substantially as described.

2. The combination, with the cylinder and valve chest, with the inlet and exhaust ports thereof,and the flap-valves M,connected therewith, ofthe valves D, located in the inlet-ports and carrying the tripping-fingers E upon their shafts, the reciprocating frame j, carrying the pivoted aproirsect-ions FF, the sustainingspring G, and tripping-springs F, and the iixed oscillating cani G', connected by arm H and rod II to the governor, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand, at Milwaukee, in the county of Milwaukee and State of Vivisconsin, in the presence of two witnesses.

MERRICK MURPHY.

lVitnesscs:

STANLEY S. STOUT, H. G. UNDERWOOD. 

